Spring balance torsion type

As mentioned above, mainly two types of balances are used beam balances and spring or torsion balances. Spring or torsion balances show a special relation between... 

Several types of viscometer are available that follow viscosity during paste preparation. Industry has widely adopted the Brabender viscometer. This has a rotational bowl and the sample exerts a force on fixed sensing elements that are dynamically balanced by a calibrated torsion spring, this causes an angular deflection of the sensing element shaft, which is continuously recorded. After the cooking, the temperature can be held at 95°C, cooled at a predetermined rate, then held at, say, 50°C to evaluate stability of the paste. The instrument is calibrated in arbitrary Brabender Units of viscosity. Typical viscosity curves of some native starches are shown in Figure 4. 

Two weighing systems need to be noted, namely, deflection and the null-point balances. There is a variety of deflection balances that can be constructed— beam type, helical spring, cantilevered beam, torsion wire, etc.—but they suffer in that the sample under observation will not remain in a fixed position in the furnace. For this reason most units employ a null-point balance. 

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